DE1115363B - Device for determining the expected short-circuit current strength in electrical power networks - Google Patents
Device for determining the expected short-circuit current strength in electrical power networksInfo
- Publication number
- DE1115363B DE1115363B DEE17481A DEE0017481A DE1115363B DE 1115363 B DE1115363 B DE 1115363B DE E17481 A DEE17481 A DE E17481A DE E0017481 A DEE0017481 A DE E0017481A DE 1115363 B DE1115363 B DE 1115363B
- Authority
- DE
- Germany
- Prior art keywords
- current strength
- circuit current
- built
- switched
- determining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Description
Gerät zur Bestimmung der zu erwartenden Kurzschlußstromstärke in elektrischen Leitungsnetzen Die Erfindung bezieht sich auf ein Gerät zur Bestimmung der zu erwartenden Kurzschlußstromstärke in elektrischen Leitungsnetzen, bei dem ein zu- und abschaltbarer zusätzlicher Netzbelastungswiderstand zu einer Grundbelastung zum kurzzeitigen Absenken der Netzspannung dient und die Differenz aus den Netzspannungen einmal bei ein- und das andere Mal bei abgeschaltetem zusätzlichem Belastungswiderstand ein Kriterium für die gesuchte Größe ist, mit Mitteln, die neben der zu erwartenden Kurzschlußstromstärke wahlweise auch Widerstandsmessungen mit Hilfe der eingebauten Stromquelle sowie Prüfungen von Fehlerstrom- und Fehlerspannungs-Schutzschaltungen gestatten.Device for determining the expected short-circuit current strength in electrical Line networks The invention relates to a device for determining the expected Short-circuit current strength in electrical power networks, in which a switchable and disconnectable additional network load resistance to a base load for short-term lowering is used for the mains voltage and the difference between the mains voltages is used once and the other time a criterion when the additional load resistor is switched off for the size you are looking for, with means that are in addition to the expected short-circuit current strength optionally also resistance measurements with the help of the built-in power source as well as Allow testing of residual current and residual voltage protective circuits.
Die zu erwartende Kurzschlußstromstärke eines Leitungsnetzes dient als Kriterium dafür, ob die einem Stromkreis vorgeschaltete Stromsicherung (Leitungsschutzsichemng oder Leitungsschutzschalter) rechtzeitig ansprechen kann bzw ob dieselbe der auftretenden Kurzschluß-Abschaltleistung gewachsen ist. Die Bestimmung Kurzschlußstromstärke dient damit nicht nur zur Prüfung der Feuersicherheit einer elektrischen Anlage, sondern auch zur Prüfung der Unfallsicherheit für den Fall, daß als Berührungsschutzmaßnahme Nullung bzw. Erdung angewandt wird. The expected short-circuit current strength of a line network is used as a criterion for whether the current fuse connected upstream of a circuit (line protection fuse or circuit breaker) can respond in time or whether the same of the occurring Short-circuit breaking capacity has grown. Determining short-circuit amperage not only serves to test the fire safety of an electrical system, but also to check accident safety in the event that as a contact protection measure Zeroing or earthing is applied.
Zur vollständigen Prüfung von elektrischen Anlagen auf Feuer- und Unfallsicherheit sind aber auch noch andere Messungen, insbesondere Widerstandsmessungen, erforderlich. Es handelt sich hier einer seits um Messungen im Niederohmbereich (z. B. For complete testing of electrical systems for fire and Accident safety also include other measurements, in particular resistance measurements, necessary. On the one hand, these are measurements in the low-resistance range (e.g.
Schutzleiter-Durchgangsmessungen bei ortsveränderlichen Geräten) und andererseits um solche im Hochohmbereich (Isolationsmessungen an Leitungen und Geräten). Für diese Widerstandsmessungen ist eine eigene Stromquelle erforderlich.Protective conductor continuity measurements for portable devices) and on the other hand, there are those in the high-resistance range (insulation measurements on cables and devices). A separate power source is required for these resistance measurements.
Weiterhin ist zur Prüfung von elektrischen Anlagen auch eine Einrichtung notwendig, mit deren Hilfe man gegebenenfalls Fehlerstrom- bzw. Fehlerspannungs-Schutzschaltungen überprüfen kann. There is also a device for testing electrical systems necessary, with the help of which fault current or fault voltage protective circuits can be installed can check.
Werden die erwähnten Meßeinrichtungen bzw. ein Teil davon in einem einzigen Gerät zusammengefaßt, dann erweist sich bei laufenden Prüfungen der Ersatz der verbrauchten Stromquelle in finanzieller wie auch in zeitlicher Hinsicht als sehr störend. Are the mentioned measuring devices or a part thereof in one combined with a single device, then the replacement proves itself during ongoing tests the consumed power source, both financially and in terms of time, than very annoying.
Die Erfindung beseitigt diesen Nachteil dadurch, daß als Stromquelle ein Sammler verwendet wird, zu dessen Aufladung ein Teil des vom Gerät während seiner Meßfunktion aus dem Netz entnommenen Stromes dient. The invention eliminates this disadvantage in that as a power source A collector is used to charge a portion of the power from the device during its Measuring function taken from the network current is used.
In weiterer Ausgestaltung der Erfindung werden parallel und/oder in Reihe mit dem eingebauten Sammler oder parallel zu einem Teil des Ladestromkreises spannungs- oder temperaturabhängige Widerstände angeordnet. In a further embodiment of the invention, parallel and / or in series with the built-in Collector or in parallel with part of the charging circuit voltage or temperature dependent resistors arranged.
Durch die Erfindung wird bei jeder Messung am Netz der Sammler selbsttätig nachgeladen. As a result of the invention, the collector becomes automatic with every measurement on the network reloaded.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEE17481A DE1115363B (en) | 1959-04-15 | 1959-04-15 | Device for determining the expected short-circuit current strength in electrical power networks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEE17481A DE1115363B (en) | 1959-04-15 | 1959-04-15 | Device for determining the expected short-circuit current strength in electrical power networks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1115363B true DE1115363B (en) | 1961-10-19 |
Family
ID=7069534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEE17481A Pending DE1115363B (en) | 1959-04-15 | 1959-04-15 | Device for determining the expected short-circuit current strength in electrical power networks |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1115363B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1067924B (en) | 1939-10-29 | Siemens S. Halske Aktiengesellschaft, Berlin und München | Device for determining the short-circuit current strength in electrical power networks | |
| AT196006B (en) * | 1956-12-17 | 1958-02-25 | Siemens Ag | Loop resistance meter |
| DE1035760B (en) * | 1957-05-08 | 1958-08-07 | Siemens Ag | Device for determining the short-circuit current strength in electrical power networks |
-
1959
- 1959-04-15 DE DEE17481A patent/DE1115363B/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1067924B (en) | 1939-10-29 | Siemens S. Halske Aktiengesellschaft, Berlin und München | Device for determining the short-circuit current strength in electrical power networks | |
| AT196006B (en) * | 1956-12-17 | 1958-02-25 | Siemens Ag | Loop resistance meter |
| DE1035760B (en) * | 1957-05-08 | 1958-08-07 | Siemens Ag | Device for determining the short-circuit current strength in electrical power networks |
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